Followup: Re: [R] Interaction Plots in R

[Prof Brian D Ripley]

The current plan is to put an S-compatible version of interaction.plot
into 1.1.0.

On Wed, 24 May 2000, Ko-Kang Wang wrote:

> Well, as I said.  I have actually put it into a package which has a help file and an
> example.
> 
> I agree with Kaspar, it may not be ready to put into R base.  I will send the package file
> to Kaspar in an hour or so as I've almost finished putting them together (now I'm just doing
> some final checking), and if he decides to put it up, anyone who is interested can download
> it, improve it (both the code and help files!), then perhaps later on it can be placed into
> R Base.
> 
> I am just curious why nobody brought this interaction plot idea up, since R has be around
> for quite a few years!

I think that shows how little interaction plots are used.  The problem I
find is that they are sometimes useful for two-way layouts, but I rarely
see such simple designs.  One often needs to plot particular
two-way interactions as part of a larger model.

Another problem is that they depend crucially on the ordering of the
levels in factors, so apart from ordered factors the order in which levels
are joined up is completely arbitrary.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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